JRC JMA-5212-4, Руководство по обслуживанию

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After converting radar signals (radar video signal, transmission timing signal, and
antenna rotation signal which are sent from the scanner) to digital data, the radar signal
processing circuit in the radar processing circuit suppresses unwanted waves, and plots
and displays radar images in accordance with the display screen.
The ARPA processing circuit receives radar signal data for which unwanted waves are
suppressed by the radar processing circuit, and performs target tracking. The results of
target tracking are sent to the main CPU in the radar processing circuit.
The AIS processing circuit processes AIS communication data which is externally input,
manages the databases of all the received AIS targets, and transmits important target
information to the main CPU. On the basis of the target information, the main CPU
displays AIS targets and necessary information on the radar display.
The display unit displays the display signals on the LCD panel that are output by the
radar processing circuit. The brightness of screen display can be adjusted by the
brilliance control on the display unit.
C. Basic radar operation
When preheating of the magnetron in the scanner is finished, the display system enters
the standby state. Pressing TX/STBY on the operation unit places the equipment in the
transmission state. The main CPU issues a transmission start command to the scanner
unit, and the scanner unit starts transmission and rotation.
Radar signals transmitted by the scanner are input to the radar processing circuit via the
power circuit, unwanted waves are suppressed, and radar images are plotted and
displayed in accordance with the display screen.
The main CPU can process signals in the radar processing circuit or change the screen
display setting according to the operation of switches and dials on the operation unit. The
results are reflected immediately to the radar image display.